Spreading lock bolt



Oct. 13, 1936. L. KIEFNER 2,057,548

SPREAD ING LOCK BOLT Original Filed Sept. 24, 1935 IN VEN TOR. LeopoZd/fzgrzefi M M Patented Oct. 13, 1936 UNITED STATES SPREADING LOCK BOLT Leopold Kiefner, Irvington, N. J.

Application September 24, 1935, Serial No. 41,835 Renewed August 28, 1936 1 Claim.

The main object of this invention is to provide a bolt and rivet with means for spreading the smaller end of the same to couple members together in a permanent manner.

Another object of the invention is to provide a spreader bolt which comprises a threaded bolt or a rivet with means for spreading one end thereof to lock two members to each other.

The above and other objects will become apparent in the description below in'which characters of reference refer to like-named parts in the drawing.

Referring briefly to the drawing Figure 1 is a longitudinal, sectional, elevational view of a threaded bolt, showing the means for spreading one end of said bolt.

Figure 2 is a top plan view of Figure 1.

Figure 3 is a longitudinal, sectional, elevational view thru a rivet showing the means for spreading one end thereof. I

Figure 4 is a top plan view of Figure 3, and:

Figure 5 is a bottom plan view of Figure 3.

Referring in detail to the drawing the numerals l8 and l I, indicate the lower and the upper members which are to be secured to each other by means of a spreader bolt. The spreader bolt comprises a suitable circular body l2, having threads l3, continuing thruout the greater portion of its length. Openings are formed in memo bers ill and I l, are aligned and are provided with threads into which the bolt member I2, is

threaded. The threads in the openings are indicated by the number I. A circular opening I8, is formed axially in the bolt body l2, and is adapted to receive a spreader plunger IS. The

upper portion of the circular opening I5, is

formed into a square I], in which a square shank of a wrench is received when it is desired to screw the body l2, into members l0 and II. The

lower end of the plunger l6, fits into a conical aperture", and is formed into a conical head.

Intersecting slots ID. are formed in the lower end of the body l2, beneath the plate "I, and the fingers 38; between these slots are adapted to be 45 spread by a plunger it, when the latter is lowered by means or a hammer thrust. In order to lock the plunger IS, in place within the opening IS, a countersunk port 20, is provided which is adapted to receive a countersink and open the wall of the body l2, above the plunger IS. The body l2, is locked in place from one side by a nut 2|.

In the rivet type of securement means members 22 and 23, represent an upper and lower member respectively. These two members are provided 5 with aligned openings thru which the shank 24, of a rivet is passed. The rivet has a bolt head 25, and an axial opening into a conical headed plunger 26, is received. The conical head 21, of the plunger terminates and registers in a pre- 10 pared similar seat in the region of intersecting slots 28, and the prongs formed by the slots are adapted to be spread outwardly as indicated by the numeral 29, in Figure 3.

The operation and use of the device is as fol- ,15 lows: In the case of the bolt the body i2, is threaded into a threaded opening in members [0 and II, the pin I6, is then inserted into the opening l5, and with a shank a pin I6, is urged downwardly by a hammer thrust, this spreads the prongs 30, and locks the body l2, in place in members l0 and II. The lock 2|, is attached to the body I2, on the upper surface of member II. A countersink is then insertedinto the opening 20, and by a hammer thrust the wall of the opening i5, is spread and locks the pin IS, in the opening IS, in the case of the rivet illustrated in Figure 3, the same procedure is gone thru. In this case the stud 26, is struck by a hammer deflecting the prongs 29, and spreading the same to locked posltion.

It is to be noted that certain changes in form and construction may be made without departing from the spirit and scope of the invention.

I-claim:

In a device of the class described, a threaded body adapted to be threaded into an opening of two members, an opening in said body, a stud in said opening, said' opening having a conical lower end, intersecting slots forming prongs at the lower 4 end of said body, said stud when struck being adapted to spread said prongs to lock said body in said members, the upper end of said opening in saidbody being formed into a square aperture, said square aperture being adapted to re- 5 ceive a similarly dimensioned member for rotating said body and means for locking said stud in said body.

LEOPOLD KIEFNER. 

